Pneumatic stay-bolt clipper.



No. 883,588. Patented' sept. 28, |899. A. HELwlG.

PNEUMATIC STAY BOLT GLIPPER.

(Application led Nov. 8, 1898.)

{No Model.)

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NTTED STATES PATENT OFFICE.

ANNA I-IELWIG, OF STL PAUL, MINNESOTA.

PNEUMATIC STAY-BOLT CLIPPER.

SPECIFICATION forming part of Letters Patent No. 633,588, datedSeptember 26, 1899.

Application led November 8, 1898.

To @ZZ whom t may concern:

13e it known that I, ANNA HELWIG, a citizen of the United States,residing at St. Paul, in the county of Ramsey and State of Minnesota,have invented certain new and useful Improvementsin Bolt and RivetCutters; and I do declare the following to be a full, clear, and exactdescription of theinvention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the iigures of reference markedthereon, which form a part of this specification.

My invention relates to improvements in bolt and rivet cutters; and themain object of my invention is to provide a light, compact, and handybolt and rivet clipper which may be handled and used with ease andrapidity and which may be operated by the pressure of air, steam, or anyother gas or fluid. This and other objects I attain by the novelconstruction and arrangement of parts illustrated in the accompanyingdrawings, in which- Figure 1 is a side view of the complete machine inquestion. Fig. 2 is a top view of Fig. 1, shown asin position forcutting off the surplus ends of stay-bolts in a piece of a steamboiler.Fig. 3 is an enlarged rear end view of the operating-cylinder. Fig. 4 isa longitudinal central section through the cylinder on a vertical linein Fig. 2 or a horizontal line in Fig. Fig. 5 is a front end view of thecylinder, or rather its front cover, showing how the working yoke issecured thereto. Fig. 6 is a side view of the piston and piston-rod andthe interior of the front portion of the machine, one of theframe-plates being removed. In this figure, also, some modifications inthe construction are shown. Fig. 7 is a detail view of an eye-stud forguiding a certain gage. Fig. 8 is a detail top view of the gage guidedand retained by the stud in Fig. 7. Fig. D is a sectional top view onthe line ci a. in Fig. G. Figs. 10 and 11 are sectional details of aportion of the rear part of the cylinder and the air, steam, gas, orother fluid admission and exhaust valve, illustrating the operation morefully.

Referring to the various parts in the drawings by reference-numerals, 11 are the cheekplates serving as the frame of the machine.

Serial No. 695,811.1.l (No model.)

These are secured together by the two bolts 2, upon which are pivotallymounted between the plates the jaw-levers 3, provided with cutting edgesor knives Ll. Upon the bolts 5, which also help to secure the plates 1 1together, are fulcrumed a pair of power-increasing levers 6 G, of whichthe front ends engage the rear ends 7 of the jaw-levers, while the longrear ends, which in Fig. 1 will be seen to curve outward toward theirends, form the operating.- levers. To or between the rear edges or lipsS of the cheek-plates is secured the end of the piston-rod 9 of thepiston 10, upon which moves back and forth the doubleacting cylinder 11,Which, upon the diametrical lug 12 of its front head 16 or otherwisesecured to it, carries the yoke 13, which by its antifriction-rollers 14closes and by its pins' 15 spreads the levers 6 as the cylinder movesbackward or forward, respectively. From the. rear cylinder-head 17 tothe outer ends of the yoke extend the rods 18, which brace the yoke, sothat it may be made very light and also serve, together with the bolts19, to keep the heads on theV cylinder, which may, however, also havethe heads screwthreaded into or, as in Fig. 4, upon its ends.

This construction enables the cylinder to be in a shell 20, formed uponthe head 17, and

secured in the shell by a screw-cap 21, and with four pipes 27, 26, 25,and 28, leading into the shell at equidistant points, as shown in Figs.3 and 11. The pipe 27 leads to the forward end of the cylinder throughthe head 12,while the opposite pipe 2G leads to the other end of thecylinder through the head 17 ,while the pipes 25 andf2S lead olf atright angles to the pipes 27 and 26, the pipe 25 being the airintakepipe and the pipe 2S being the exhaustpipe from the cylinder. The plug22 is formed with two elongated cavities 23 24 on opposite sides, asshown in Fig. 10, adapted to alternately connect the pipes 27 and 25 orpipes 2S and 26, or vice versa, as the case may bethat is to say, if theplug 22 be turned as IOO shown in Fig. ll the compressed air will tlowthrough the passage and pipe 27 into the forward end or" the cylinder,and the air on the opposite side of the cylinder will exhaust throughthe pipe 26, passage 24, and pipe 28. Then if the plug 22 be turnedone-fourth a revolution the air entering by the pipe 25 will flowthrough the passage 23 and pipe 26 to the rear end of the cylinder andexhaust through the pipe 27, passage 24, and pipe 28 from the front endof the cylinder.

The valve 22 is adapted to be operated by pins or arms 29, attached tothe rearwardlyextended valve-stem 3l, and the throw is limited by astop-pin 32. IVhen the pins 29 are thrown as shown in Fig. 3, thepassages 23 and 24 will be in the reversed position from that shown inFig. ll, and if the pins 29 be reversed in position then it will bereadily understood the valve will be reversed.

The valve-stem 3l serves the double purpose of a means for rotating thevalve and also as a handle by which to guide the machine.

33 is a clevis by which the machine may bel suspended from acounterbalanced rope to assist in raising` and lowering it aboutsteamboilers and other iron structures on which it is to operate. Thisclevis maybe secured in any suitable way and to any suitable point ofthe machine; but in the present instance it is shown as pivoted on thebolt 34, by which the piston-rod is secured to the plates and which isextended so that its outer end forms a handle 35 and its inner end formsa gage 36, adapted to touch against the plate of the structure workedupon, as shown at 37, and thus cause the edges of the cutters to come totheir transverse position upon the bolts to be cut just as soon as theyare thrown up to the plate of the structure. The quick guiding of thecutting edges to the proper point and position upon the bolt to be cutis further facilitated by the sliding gage or guide 38, which is guidedbetween the adjacent roundings 39 of the jaw-levers and the plates l land has its rear and round portion encircled by a coil-spring 40 andretained in the eye-stud 4l by the pin 42. The spring 40, buttingagainst the eye-stud, holds the slide normally forward with the pin 42against the stud 4l and the front end 43 against the side of the bolt 44to be cut, and which is thereby held about centrally to the knives, asshown in Figs. l and 6.

The piston-rod may have shoulders, like 45, butting against the rear endof the cheekplates l, to help the pin 36 take the pushing pressure onthe piston-rod, or the additional pin 46 may be inserted, as shown inthe moditication Fig. 6, where the piston-rod is thus made rigid withthe plates l and serves thereby as a guide for the cylinder directly andfor the operating-levers indirectly through the yoke 13. In themodification shown in Fig.

6 the intermeshing cogs 47 are dispensed with and dependence placed onthe coaction of the the gage 38, only that they are regulated andretained not by a pin, but by nuts placed, like 5l, upon the stem 52,which projects through the back side of the lever.

In operation the gages 48 touch against the face of the boiler-plate orother structure operated upon, and thus hold theknives the properdistance from the plate, and the gage or guide 38 guides the knives intotheir central position relatively to the bolt, and the guide 36 insuresthe transverse position of the knives across the bolt, so that themachine can in an instant be placed in correct position on the bolt.Usually, after the machine is suspended by a rope or chain, theoperator, with one hand on the handhold 35 and with the other hand onthe handle formed by the valve-stem 3l, places the machine on the boltand turns the stem 3l, so that the compressed air or other similar agententers the rear end of the cylinder and forcing it and the yokerearwardly operates the levers and cuts the bolt fast or slowly,according as the stop-levers 29 are regulated relatively to the stop,giving the air a larger or smaller inlet to the cylinder. The valve-plugis then turned in the reverse direction, so that the air exhausts fromthe rear and enters the front end of the cylinder, which moves thelatter forward, thereby spreading the levers 6 and the knives 4 intoreadiness for operation on the next bolt. The yielding spring 40 allowsthe guide 38 to slide backward when pressed upon by the spreading of thebolt as the knives cut through it. In like manner the springs 49 on thegages 48 yield, so as to prevent the knives from breaking when they areslightly drawn toward the work or plate by their greater bevel orgrinding on the outer than the inner side.

53 are holes in the levers 6 for the reception of the stops 54 to arrestthe rearward motion of the yoke when the edges of the knives aresutliciently close together to sever anything between them. As theknives get worn and shortened by grinding the stops are moved rearward.

It is obvious that the form and location of the valve and its connectionwith the cylinder, as well as the shape of the yoke and braces on it,may be much varied without diverging from the spirit of this invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

l. A bolt or rivet cutter comprising two plates for its frame havingpivoted between said plates a pair of jaw-levers and a pair ofpower-increasing operating-levers engaging the jaw-levers; a piston-rodhaving one end secured to said plat-es and its other end pro- IOS IIO

vided with a piston, a cylinder sliding upon said piston and piston-rodand carrying a yoke which engages the operating-levers so as to spreadand close them, and a valve arrangement for conducting compressed air orsimilar agent into and from either end of the cylinder, substantially asshown and described.

2. A bolt or rivet clipper comprising two plates for its frame havingpivoted between said plates a pair of jaw-levers and a pair ofpower-increasing operating-levers engaging the jaw-levers; a piston-rodhaving one end secured to said plates and its other end provided with apiston, a cylinder sliding upon said piston and piston-rod and carryingayoke which engages the operating-levers so as to spread and close them,and a valve arrangement for conducting compressed air or similar agentinto and from either end of the cylinder, said yoke carryingantifriction-rollers to lessen the friction of its contact with thelevers.

3. A bolt or rivet cutter comprising two plates for its frame havingpivoted between said plates a pair of jaw-levers and a pair ofpower-increasing operating-levers engaging the jaw-levers; a piston-rodhaving one end secured to said plates and its other end provided with apiston, a cylinder sliding upon said piston and piston-rod and carryinga yoke which engages the operating-levers, so as to spread and closethem, and a valve arrangement for conducting compressed air or similaragent into and from either end of the cylinder, said yoke carryingantifriction-rollers to lessen the friction of its contact with thelevers, and said operating-levers being curved outward toward their freeend, substantially as shown and described.

et. A bolt or rivet cutter comprising two plates for its frame havingpivoted between said plates a pair ot' jaw-levers and a pair ofpower-increasing operating-levers engaging the jaw-levers; a piston-rodhaving one end secured to said plates and its other end provided with apiston, a cylinder sliding upon said piston and piston -rod and carryinga yoke which engages the operating-levers so as to spread and closethem, and a valve arrangement for conducting compressed air or similaragent into and from either end of the cylinder, said operating-levershaving adjustable stops to limit the motion of the yoke, substantiallyas shown and described.

5. A bolt or rivet cutter comprising two plates for its frame havingpivoted between said plates a pair of jaw-levers and a pair ofpower-increasing operating-levers engaging the jaw-levers; a piston-rodhaving one end secured to said plates and its other end provided with apiston, a cylinder sliding upon said piston and piston-rod and carryinga yoke which engages the operating-levers so as to spread and closethem, and a valve arrangement for conducting compressed air or l similaragent into and from either end of the cylinder, said yoke being securedat one end i of the cylinder or its head and having braces from near itsouter ends to the head at the other end of the cylinder, substantiallyas shown and described.

6. In a bolt and rivet clipper the combination with a pair ofcutting-jaws having their cutting edges standing at a bevel with theside of the machine, of a guide projecting from the side of the machineand adapted to touch the plate of the structure operated upon when thecutters are near the plat-e and stand parallel toits face, substantiallyas and for the purpose set forth.

'7. A boltor rivet clipper having a guide touching one side of the boltto be cut when the knives of the cutter are in central position to thebolt, substantially as set forth.

8. In ay bolt or rivet cutter of the class described, the combination ofyielding gages 48, and 38, adapted to guide the cutting edges of themachine both in longitudinal and transverse direction upon the bolt tobe cut, substantially as shown and described.

9. In a bolt or rivet cutter of the class described, the combination ofyielding gages 48 and 3S, adapted to guide the cutting edges of themachine, both in longitudinal and transverse direction upon the bolt tobe cut, and a rigid guide adapted to touch the work and hold the cuttingedges across the bolt, substantially as shown and described.

lO. A bolt and rivet clipper of the class described, the same having ayielding guide or gage touching the side of the bolt or rivet to be ontwhen the knives are about central to the bolt, so as to prevent cuttingat the corners or ends of the cutting edges, substantially as set forth.

ll. A bolt or rivet cutter having a longitudinally-moving cylinderadjacent to its operating-levers and a yoke or arms extending from thecylinder and operating the levers, a piston in the cylinder and apiston-rod extending therefrom and secured with its outer end to theframework of the machine, and means for admitting steam or compressedair or fluid to the cylinder, substantially as and for the purpose setforth.

l2. In a bolt or rivet cutter of the class described, the combinationwith the cylinder ll, having the yoke 13, operating the levers of themachine, of the centrally-arranged rotary valve 20, at the end of thecylinder, communicatingwith both ends thereof, and having an inlet andexhaust pipe, the stem 3l, extending from the plug of the valve, the twolevers 29, adj ustably secured on the stem and the stop 32 limiting themotion of the said levers, substantially as and for the purpose setforth.

In testimony whereof I afiix my signature in presence of two witnesses.

ANNA HELVVIG.

XVitnesses:

MoN. SEYMOUR, A. M. GARLSEN.

IOO

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